横向
1
Group of similar cells
4
Element found in all living things
5
Compound containing oxygen
7
Unit of heredity
纵向
2
Curved glass that refracts light
3
Nerve cell in the brain
6
Unit of energy
8
Gas essential for breathing
Group of similar cells
Element found in all living things
Compound containing oxygen
Unit of heredity
Curved glass that refracts light
Nerve cell in the brain
Unit of energy
Gas essential for breathing